Time-of-Day Port Pinouts
To ensure proper signal integrity at the receiver, we recommend that you use a 50-ohm termination, as shown
in the figure below. The output swing at 50-ohm load is guaranteed to be 2.9 V.
Figure 60: Terminating 1-PPS Signal
Component
Label
1-PPS SMB connector
1
External 50 ohm resistor
2
The table below summarizes the ToD/1-PPS port pinouts for ASR900-RSP1-55.
Table 21: RJ45 1-PPS/ToD Port Pinouts
Description
Direction
Signal Name
Pin
Do not connect
—
RESERVED
1
Do not connect
—
RESERVED
2
Do not connect
Output
RESERVED
3
—
—
GND
4
Time of Day character
—
GND
5
Do not connect
Input
RESERVED
6
Time of Day character
Output or Input
TOD_P
7
Cisco ASR 902 and ASR 902U Aggregation Services Router Hardware Installation Guide
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Troubleshooting
Time-of-Day Port Pinouts